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Inventories (Tables)
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventories

Inventories, net consisted of the following:

      March 31,       December 31,
2018 2017
U.S. $ in thousands
        Finished goods $ 67,910 $ 63,234
Work-in-process 2,770 2,271
Raw materials 49,385 50,212
$      120,065 $      115,717